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VH..A.1L1IWEY. MACHINERY FOR ROLLING SCREW THREADS. No. 248,165. Patented Oct. 11,1881.

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H'. A. luuzvm.4 Y MAGHINERY FOR ROLLING SCREW THREADS.

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H. A. HARVEY. l vBAAGHINEM P0P. ROLLING SCREW THREADS.

`1\I0.248,165. Patenned0t.11`,`1881.

UNITED STATES PATENT OFFICE.

HAYWARD A. HARVEY, or ORANGE, NEW JERSEY.

MACHINERY FOR ROLLING SCREW-THREADS.'v

SPECIFICATION forming part of Letters .Patent No. 248,165, dated October 11, 1881.

' Application filed April 7. 1881. (No'model.)

To all whom it may concern:

Be it known that I, HAYWARD, A. HARVEY, of Orange, New Jersey, have invented certain Improvements in Machinery for Rollin g Screw- Threads, `of which the following is a specification.

My improvements relate to that class of machines for rolling screw-threads in which the thread is formed upon the barrel of the screw io or bolt by a series of progressive rolling operations respectively performed by pairs of dies, each pair consisting ot a stationary die and a movable die, both dies having their workingfaccs suitably ribbed; and my inventionconsists, rst, in the combination, with a pair of such dies, of an adjustable deliverer moving in'ja path parallel or concentric with `the path of movement of the working-face of the moving die, for the purpose of insuring the seizing 2o of the blank by the dies at the time when the ribs on lthe opposed faces ot' the two dies respectively occupy prescribed relative positions. rlhe second feature of my invention consists in devices for carrying or guiding the screwblank by the head during its transferfrorn one pair of dies, from which it is delivered, to the next following pair of dies, by which it is received, and for holdin gthe screw-blank against the face of the rotating receiving-die with an 3o elastic pressure.

My improvements are embodied in the inachine represented in the accompanying drawings, which in certain general aspects resembles the machine shown and described in Let- 3 5 ters Patent of the United States No. 223,7 30, dated January 20,1880, granted to me for an improvement in machines for rolling threads of screws or bolts.

The drawings are as follows:

4o Figure l is a top view of a machine containl ing three systems of rolling-dies. Fig. `2`is a front elevation of the same. Fig. 3 is a top view of the dies, with the exception of the rst rotating die, which is removed for the purpose 4 5 of exhibiting the mechanism for operating the pusher, which delivers the blanks to the rst pair of dies. Fig. 4 is a top view of the springholding jaws with which the pusher is provided. Fig. 5 is a top view of the primary rotat- 5o ing die, showing three equidistant adjustable pins, which extend vertically through concentric slots in the die, and successively operate the pusher. Fig. 6 is a horizontal section, taken immediately beneath the primary rotating die, showing the manner in which the vertical pins operate the pusher. Fig. 7 is a top view, upon an enlarged scale, of portions of the dies, in which a top view is given of the transferring device for transferring the blanks from the first pair of dies to the second pair of 6o dies, and a horizontal section is given of a `similar transferring device for transferring blanks from the second pair of dies to the third pair of dies, such section being taken through the line w a' on Fig. 8, which is an elevation of 65 the transferring device, showing the second pair ot' dies in vertical section through the line y y on? Fig. 7.

The machine represented in the drawings has 'a suitable frame, A, which supports a hori- 7o zontal driving-shaft, B, driven by a belt on the pulley B.

The cylindrical dies are respectively mounted upon the upper ends of parallel vertical shafts. Theverticalshafts are geared together by suitable cog-wheels, B3, and are rotated by power transmitted from the driving-shaft by means ot' the bevel-gearing B2.

The arrows on Fig. 1 indicatethe direction of rotation, respectively, of the primary rotat- 8o ing die C, the secondary rotating die D, and

the :tinishing rotating die E.

The machine is provided with a well-known form of feeding mechanism, consisting of the hopper F, ways F', and check F2 for cutting 85 oft' thelowermost blank from the row of lblanks hanging by their heads in the ways, and 4dropping it through the tube F3 into the cylindrical space between the jaws 7L h of the pusher H. The pusher His a curved metallic plate affixed 9o to the vertical post g, inserted in the free end of the oscillating arm G, by which itis moved in the arc of a circle between theface of the rotating vdie C' and the stationary curved die C. A spring-arm, g', ishung upon the 1ower 95 part of the post g immediately above the arm l G, and is hence adapted to oscillate in a plane parallel with the plane of oscillation of the arm G.

The position of the spring-arm g relatively roo to the arm G, upon which it oscillates, is governed by the stationary tripping-cani g2, the

face of which affords a bearing for the vertical pin g3, inserted in the outer part of the arm g. The pin g3 is held against the face of the stationary tripping-cam g2 by thcforce of theleafspring g, affixed to the arm g', bearing at its free end upon the nose ot' the trigger g5 when the trigger g5 is in engagement with either ot' the pins I. As the pins I are disengaged from the trigger g5 the arm G is retracted by the spring G. The upper edge ot' the pusher H projects slightly above the ripper surfaces of the dies, and has affixed toit the stationary jaw h and the pivoted spring-jaw h.

For clearness of illustration the pusher-jaws hand hareomitted from Fig. 3 and are shown in Fig. 4.

As the primary die C rotates the projecting lower ends of the vertical pins I are successively swept against the trigger g'", thus causing the arm Gto swing upon its axis and push into the space between the rotating die C and the stationary die C a blank which may have been deposited in the jaws 71 and h of the pusher.

It will be seen that the vertical pins I are inserted through the concentric slots t in the rotating die C, and are therein held, respectively, by the clamping-nuts fi. The length of the concentric slots i isproportioned with reference to aiording a sutiicient range ot' lateral adjustment for the vertical pins I to enable them to be fixed at the exact points required, in order that they may commence to actuate the oscillating arm G at the instant when the ribs upon the face ot` the rotating die occupy, relatively to the ribs upon the face of the stationary die, the desired positions. Thus, it' the machine is to be employed for rolling a singlcthreadcd screw, the relative positions ot' the dies should be such that the apices ot' the ribs, intersected by a radial plane, shall occupy elevations midway between the elevations occupied by the apices of the ribs ot' the other die in the same radial plane.

As one die is stationary and the other is movable, it will of course be understood that these relations are constantly changing, and it is ot' the utmost importance that the blank should be seized by the dies at the instant when the ribs of the dies occupy the proper relative positions.

The machine may also be employed to roll a double thread-th at is,to form two independent spiral threads upon the body of the blankin which case the apices ot' the opposed ribs in the vertical plane wherein the screw is first seized should occupy the same elevations. ,lf desired, therefore, sufiicient range of adjustment may be given to the vertical pins I to enable the machine to roll either one or two threads upon the body of the blank.

The mechanism for transferring the partiallyformed screw from one pair or" dies to the next following pair ot' dies consists of the two spring-plates K and L, the curved edges of which respectively constitute portions ot the concentric paths along' which the partiallyformed screw is rolled by the action ot' the rotating dies.

rlhe spring-plate K is atiixed to the vertical shaft K, having its bearings in the frame M, which extends diagonally across the space between the rotating dies. The spring-plate K has a small range of oscillation in a horizontal plane immediately above the surface ot' the die. The concave edge k ofthe spring-plate K is curved upon substantially the same radius as the stationary die, from which the partiallyformed screw is delivered, which for the purposes of illustration I will call the deliverydie. The concave edge lc forms a continuation of the curved path afforded by the stationary delivery-die, along which the screwin process of formation is rolled progressively by the action ot' the rotating die. The springplate K is pressed toward the rotating delivery-die by the springjc. The spring-plate K is rounded at its free end 7a2, and extends toa point immediately beyond those parts of the two adjacent rotating dies which are nearest together.

The spring-plate L, affixed to the vertical shaft L', and having alimited range of oscilla- K, while the concave portion l is so curvedA as to constitute a portion of the curved path along which the partially-formed screw is rolled by the receiving rotating die, the remainder of that path being afforded by the receiving stationary die. The spring l2 presses the free end ot' the plate L towardthe plate K.

In operation the partially-formed screw, as it is rolled along the curved edge 7c of the spring-plate K, presses back the free end l ot' the spring-plate L, this result being secured by making the spring k2 more powerful than the spring l2. When, however, the blank has been rolled to the end of the spring-plate K the spring-plate L pushes the blank laterally against the face of the receiving rotating die, and the curved edge l of the spring-plate L ail'ords the exterior path along which the partially-tinished screw is rolled to the entrance of the passage between the receiving rotating die and the reccivin g stationary die. This passage, however, will not permit the entrance of the partially-formed screw until the apices of the ribs upon the working-faces ofthe receiving stationary die and the receiving rotating die at the place where the screw is to enter occupy the proper relative elevations, lso that they may respectively engage the parallel recesses presented upon the opposite sides of the screw which have resulted from the formation upon the blank of a spiral groove by the preceding par of dies.

It will, of course, be understood that this transferring mechanism is adapted for employment between any two adjoining pairs of dies'.

ICO

IIO

Another function performed by the springplates K and L is the suspension of the partially-formed screw by the head during its transfer from one pair of dies to the next following pair of dies. The partially-finished screw is prevented from dropping by the engagement ot' its barrel beneath the head with the edges of the spring-plates K and L respectively., and there is thereby insured the presentation of the partially-nuished screw to the receivingdies upon the proper level to enable the ridges on the face of the receivingdies to engage that part only ofthe barrel upon which the thread is to be formed. This control of the vertical position of the screw-blank by its head is especially important in the manufacture of rolled screws having the threaded portions of their barrels of the same diameter as the unthreaded portions, in which case the portion ofthe barrel which is to be threaded is first reduced in diameter, as more fully described in my pending application for a patent for this method of manufacturing screws, tiled April 4, 1881.

I claim as my inventionl. In a machine for rolling the threads ot' z5 screws, substantially such as described, the circularly-adjustable pins I, secured to the rotating die C, for actuating the oscillating arm G, which carries the pusher H, substantially as described. 3o

stantially as set forth. f

H. A. HARVEY.

Witnesses M. L. ADAMS, EDWD. PAYsoN. 

